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Bipropellant (MON/MMH) Thrusters
DASA has developed a 4-27,500 N range of bipropellant thrusters, together with fill systems and
fill & drain valves. Almost 600 units have been produced for satellites such as Galileo, TDF,
Telecom 2, Hispasat, Turksat & Cluster.
| Dry Mass(gm) | 0.350 kg |
| Length(cm) | 138 mm |
| Diameter(cm) | 67 mm |
| Mounting Method | fixed |
| Engine Cycle | pressure fed |
| Oxidizer | MON |
| Fuel | monomethyl hydrazine |
| Mixture Ratio | 1.55-1.72 over thrust range |
| Thrust | 8-11.4 N vacuum |
| Isp | 287 sec |
| Expansion Ratio | 90 |
| Combustion Chamber Pressure | ~18 atm over thrust range |
| Dry Mass | 0.270 kg |
| Length | 105mm |
| Diameter | 29 mm |
| Mounting Method | fixed |
| Oxidizer | MON |
| Fuel | monomethyl hydrazine |
| Engine Cycle | pressure fed, at 5-25 atm |
| Thrust | 1.77-5.26N |
| Isp | 290 sec |
| Mixture Ratio | 1.5-1.85 over thrust range |
| Expansion Ratio | 190 |
| Engine Cycle | pump-fed (feed pressure 18.0 atm) |
| Dry Mass | 111 kg |
| Length | 2195 mm |
| Max Diameter | 1263 mm |
| Mounting Method | gimballed +/- 6 degrees by electromechanical actuators |
| Oxidizer | N2O4 at 5.89 kg/s |
| Fuel | monomethyl hydrazine at 2.87 kg/s |
| Mixture Ratio | 2.05:1 |
| Thrust | 27.5 kN vacuum |
| Isp | 324 sec vacuum (potential 331 sec) |
| Pressure | 10.42 atm |
| Expansion Ratio | 83.3:1 |
| Cooling | regeneratively (fuel) cooled nozzle to 10:1 area ratio |
| Materials | stainless steel inner liner with milled cooling passages and electrolytically
deposited
nickel layer for outer closure |
| Injector | 132-element coaxial. Fuels enter injector from the chamber cooling channels. Oxidizer is distributed to elements via manifold at rear. |
| Nozzle Cooling | radiation cooled extension below 10:1 area ratio |
| Fuel | monomethyl hydrazine |
| Mixture Ratio | 1.64:1 |
| Oxidizer | MON |
| Dry Mass | 2.8 kg |
| Mounting Method | fixed |
| Engine Cycle | pressure fed, at 18 atm |
| Length | 531 mm |
| Max Diameter | 248 mm |
| Expansion Bell | stainless steel |
| Thrust | 400N |
| Isp | 308 sec |
| Expansion Ratio | 102/150 |
| Combustion Chamber Pressure | 6.9 atm |
| Combustion Chamber Materials | stainless steel using MMH regenerative cooling |
| Injector | stainless steel swirl injector, double cone |
| Dry Mass | 14.5 kg |
| Length | 1030 mm |
| Max Diameter | 530 mm |
| Mounting Method | fixed |
| Engine Cycle | pressure fed |
| Oxidizer | MON 3 |
| Fuel | monomethyl hydrazine |
| Thrust | 3500 N |
| Isp | 352 sec |
| Mixture Ratio | 1.6-2.1 |
| Expansion Ratio | 125 |
| Combustion Chamber Pressure | 9-12 atm |
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